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A network-related problem affecting multi-user access is “QuickBooks Error H505“. This happens when the server that hosts the company file is not found by QuickBooks Desktop. Collaboration between users may be hampered by this error. In order to fix it, make sure QuickBooks is hosted correctly in a multi-user environment, and check firewall permissions and network settings. For prompt assistance, call 1.855.738.2784 to speak with our QuickBooks Experts Team.